The Seven Deadly Sins, along with Elizabeth Liones and Hawk, have won the Kingdom of Leones back from the Holy Knights. At long last, it's their time to indulge in the peaceful lives they fought for. From inedible meat pies, overdue battles, unexpected stalkers, and the butterflies of first love, the Sins are accompanied by their friends in their carefree, fun-filled time together. However, the calm is broken with the premonition of a new threat, bringing upon the signs of Holy War and threatening to shatter the peace of the Sins' easygoing days.

A seven minute epilogue to the TV series, released as an OVA.

Throughout life, people come and go, eventually departing with a goodbye. For childhood friends Natsumi Aizawa, Yuka Hanaki, and Rinko Tamaki, they are confronted with this harsh reality when they are told their group's fourth member, Saki Mizukoshi, is moving away at the end of summer. With this news threatening their friendship, the four girls seek out a magic stone from local folklore—hoping to use its rumored wish-granting powers to keep them together. After following the steps of the supposed legend, they are surprised to discover that the magic is real. While the summer's end looms over the horizon, Natsumi and the others use the stone to ensure they have no lingering regrets until the end. But regardless of what the future might bring, these four friends will never forget the colorful miracles they experience during what could be their final summer together.

Ren Mihashi was the ace of his middle school's baseball team, but due to his poor pitching, they could never win. Constant losses eventually lead to his teammates bullying him and reached the point where his teammates no longer tried to win, causing Mihashi to graduate with little self-esteem. As a result, Mihashi decides to go to a high school in a different prefecture where he has no intention of playing baseball. Unfortunately, upon his arrival at Nishiura High, he is dragged into joining their new team as the starting pitcher. Although unwilling at first, Mihashi realizes that this is a place where he will be accepted for who he is; with help from the catcher Takaya Abe, he starts to have more confidence in his own abilities. Abe, seeing the potential in Mihashi, makes it a goal to help him become a pitcher worthy of being called an ace.